I just wanted to share that I've had success using a 1940's Gillette Super Speeds to hold a DE blade half. It shaved just fine.
Why would you do this? Well, the theory is that by only exposing one edge at a time to soap and water and skin oils, you get more life out of the whole DE blade. There's some evidence to back this up, but I haven't taken the yet time to see out what my average # of shaves per blade is.